upadate: Added image hashes for similarity check
upadate: Added image hashes for similarity check

* Clean up arg parser arguments

* Added args for choosing hash function which will be used in similarity check
* Added debug arg for showing debug informations

* Added pHash function for computing perceptual hash of images

* Added aHash function for computing average hash of images

* Added dHash function for computing diference hash of images

* Added function for computing hamming distance of our hashes

* Moved orb feature detection and matching to seperate function

* Now in function that checks if last saved image and current image
  are similar dHash algoritm is use to compute hashes of given images
  then hamming distance of these hashes is computed and similarity ratio
  is check against set similarity value

Foxiy/board2slides